|
|
EM-116 [YD] NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING Use the Chart Below to Help You Find the Cause of the Symptom. EBS00QF7 1. Locate the area where noise occurs. 2. Confirm the type of noise. 3. Specify the operating condition of engine. 4. Check specified noise source. If necessary, repair or replace these parts. A: Closely related B: Related C: Sometimes related —: Not related Location of noise Type of noise Operating condition of engine Source of noise Check item Refer- ence page Before warm- up After warm- up When start- ing When idling When racing While driving Top of Ticking or C A — A B — Tappet Valve clearance Rattle C A — A B C Camshaft Camshaft oil clearance Crank- Slap or — A — B B — Piston pin Piston to piston pin Slap or A — — B B A Piston Piston to cylinder bore Knock A B C B B B Connect- Connecting rod bush- Knock A B — A B C Main Main bearing oil clear- Front of Tapping or A A — B B B Timing Timing chain cracks Front of Squeak- A B — B — C Drive belts Drive belts deflection Creaking A B A B A B Drive belts Idler pulley bearing Squall A B — B A B Water Water pump operation |